UST Journal Club
A Protostellar System Fed by A Streamer of 10,500 AU Length 2023-08-21
- Speaker : KOH Dong-Hyeok
- Date : 2023-03-08 12:00 ~ 13:00
- Place : JYS 331-1
- Professor :
Binary formation is an important aspect of star formation One possible route for close-in binary formation is disk fragmentation . Recent observations show that small-scale asymmetries (<300 au) around young protostars. although not always resolving the circumbinary disk, are linked to disk phenomena In later stages. resolved circumbinary disk observations (<200 au) show similar asymmetries. suggesting that the asymmetries arise from binary-disk interactions We observed one of the youngest systems to study the connection between disk and dense core . We find a bright and clear streamer in chemically fresh material (carbon-chain molecular species) that originates from outside the dense core (> 10,500 au) . This material connects the outer dense core with the region where asymmetries arise near disk scales. This new structure type, ten times larger than those seen near disk scales, suggests a different interpretation of previous observations: large-scale accretion flows funnel material down to disk scales. These results reveal the under-appreciated importance of the local environment on the formation and evolution of disks in early systems and a possible initial condition for the formation of annular features in young disks.